spherical geometry

== English == === Noun === spherical geometry (usually uncountable, plural spherical geometries) (geometry, uncountable) The geometry of the 2-dimensional surface of a sphere;(countable) a given geometry of the surface of a sphere; a geometry of the surface of a given sphere, regarded as distinct from that of other spheres. 1972, Morris Kline, Mathematical Thought from Ancient to Modern Times: Volume 1, Oxford University Press, 1990, paperback, page 119, Spherical trigonometry presupposes spherical geometry, for example the properties of great circles and spherical triangles, much of which was already known; it had been investigated as soon as astronomy became mathematical, during the time of the later Pythagoreans. 2020, Marshall A. Whittlesey, Spherical Geometry and Its Applications, Taylor & Francis (CRC Press), unnumbered page, It has been at least fifty years since spherical geometry and spherical trigonometry have been a regular part of the high school or undergraduate curriculum. ==== Related terms ==== spherical trigonometry ==== Translations ==== === See also === astrometry elliptic geometry great circle non-Euclidean geometry parallel postulate === Further reading === Non-Euclidean geometry on Wikipedia.Wikipedia Elliptic geometry on Wikipedia.Wikipedia Great circle on Wikipedia.Wikipedia Spherical trigonometry on Wikipedia.Wikipedia Spherical polyhedron on Wikipedia.Wikipedia Spherical astronomy on Wikipedia.Wikipedia Celestial coordinate system on Wikipedia.Wikipedia Spherical geometry on Encyclopedia of Mathematics